/*
 * Copyright (c) 2016-present, Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under both the BSD-style license (found in the
 * LICENSE file in the root directory of this source tree) and the GPLv2 (found
 * in the COPYING file in the root directory of this source tree).
 */
#include <gtest/gtest.h>

#include <array>

#include "Options.h"

using namespace pzstd;

namespace pzstd {
bool operator==(const Options& lhs, const Options& rhs) {
    return lhs.numThreads == rhs.numThreads && lhs.maxWindowLog == rhs.maxWindowLog
           && lhs.compressionLevel == rhs.compressionLevel && lhs.decompress == rhs.decompress
           && lhs.inputFiles == rhs.inputFiles && lhs.outputFile == rhs.outputFile && lhs.overwrite == rhs.overwrite
           && lhs.keepSource == rhs.keepSource && lhs.writeMode == rhs.writeMode && lhs.checksum == rhs.checksum
           && lhs.verbosity == rhs.verbosity;
}

std::ostream& operator<<(std::ostream& out, const Options& opt) {
    out << "{";
    {
        out << "\n\t"
            << "numThreads: " << opt.numThreads;
        out << ",\n\t"
            << "maxWindowLog: " << opt.maxWindowLog;
        out << ",\n\t"
            << "compressionLevel: " << opt.compressionLevel;
        out << ",\n\t"
            << "decompress: " << opt.decompress;
        out << ",\n\t"
            << "inputFiles: {";
        {
            bool first = true;
            for (const auto& file : opt.inputFiles) {
                if (!first) {
                    out << ",";
                }
                first = false;
                out << "\n\t\t" << file;
            }
        }
        out << "\n\t}";
        out << ",\n\t"
            << "outputFile: " << opt.outputFile;
        out << ",\n\t"
            << "overwrite: " << opt.overwrite;
        out << ",\n\t"
            << "keepSource: " << opt.keepSource;
        out << ",\n\t"
            << "writeMode: " << static_cast<int>(opt.writeMode);
        out << ",\n\t"
            << "checksum: " << opt.checksum;
        out << ",\n\t"
            << "verbosity: " << opt.verbosity;
    }
    out << "\n}";
    return out;
}
}  // namespace pzstd

namespace {
#ifdef _WIN32
const char nullOutput[] = "nul";
#else
const char nullOutput[] = "/dev/null";
#endif

constexpr auto autoMode = Options::WriteMode::Auto;
}  // anonymous namespace

#define EXPECT_SUCCESS(...) EXPECT_EQ(Options::Status::Success, __VA_ARGS__)
#define EXPECT_FAILURE(...) EXPECT_EQ(Options::Status::Failure, __VA_ARGS__)
#define EXPECT_MESSAGE(...) EXPECT_EQ(Options::Status::Message, __VA_ARGS__)

template <typename... Args>
std::array<const char*, sizeof...(Args) + 1> makeArray(Args... args) {
    return {{nullptr, args...}};
}

TEST(Options, ValidInputs) {
    {
        Options options;
        auto args = makeArray("--processes", "5", "-o", "x", "y", "-f");
        EXPECT_SUCCESS(options.parse(args.size(), args.data()));
        Options expected = {5, 23, 3, false, {"y"}, "x", true, true, autoMode, true, 2};
        EXPECT_EQ(expected, options);
    }
    {
        Options options;
        auto args = makeArray("-p", "1", "input", "-19");
        EXPECT_SUCCESS(options.parse(args.size(), args.data()));
        Options expected = {1, 23, 19, false, {"input"}, "", false, true, autoMode, true, 2};
        EXPECT_EQ(expected, options);
    }
    {
        Options options;
        auto args = makeArray("--ultra", "-22", "-p", "1", "-o", "x", "-d", "x.zst", "-f");
        EXPECT_SUCCESS(options.parse(args.size(), args.data()));
        Options expected = {1, 0, 22, true, {"x.zst"}, "x", true, true, autoMode, true, 2};
        EXPECT_EQ(expected, options);
    }
    {
        Options options;
        auto args = makeArray("--processes", "100", "hello.zst", "--decompress", "--force");
        EXPECT_SUCCESS(options.parse(args.size(), args.data()));
        Options expected = {100, 23, 3, true, {"hello.zst"}, "", true, true, autoMode, true, 2};
        EXPECT_EQ(expected, options);
    }
    {
        Options options;
        auto args = makeArray("x", "-dp", "1", "-c");
        EXPECT_SUCCESS(options.parse(args.size(), args.data()));
        Options expected = {1, 23, 3, true, {"x"}, "-", false, true, autoMode, true, 2};
        EXPECT_EQ(expected, options);
    }
    {
        Options options;
        auto args = makeArray("x", "-dp", "1", "--stdout");
        EXPECT_SUCCESS(options.parse(args.size(), args.data()));
        Options expected = {1, 23, 3, true, {"x"}, "-", false, true, autoMode, true, 2};
        EXPECT_EQ(expected, options);
    }
    {
        Options options;
        auto args = makeArray("-p", "1", "x", "-5", "-fo", "-", "--ultra", "-d");
        EXPECT_SUCCESS(options.parse(args.size(), args.data()));
        Options expected = {1, 0, 5, true, {"x"}, "-", true, true, autoMode, true, 2};
        EXPECT_EQ(expected, options);
    }
    {
        Options options;
        auto args = makeArray("silesia.tar", "-o", "silesia.tar.pzstd", "-p", "2");
        EXPECT_SUCCESS(options.parse(args.size(), args.data()));
        Options expected = {2, 23, 3, false, {"silesia.tar"}, "silesia.tar.pzstd", false, true, autoMode, true, 2};
        EXPECT_EQ(expected, options);
    }
    {
        Options options;
        auto args = makeArray("x", "-p", "1");
        EXPECT_SUCCESS(options.parse(args.size(), args.data()));
    }
    {
        Options options;
        auto args = makeArray("x", "-p", "1");
        EXPECT_SUCCESS(options.parse(args.size(), args.data()));
    }
}

TEST(Options, GetOutputFile) {
    {
        Options options;
        auto args = makeArray("x");
        EXPECT_SUCCESS(options.parse(args.size(), args.data()));
        EXPECT_EQ("x.zst", options.getOutputFile(options.inputFiles[0]));
    }
    {
        Options options;
        auto args = makeArray("x", "y", "-o", nullOutput);
        EXPECT_SUCCESS(options.parse(args.size(), args.data()));
        EXPECT_EQ(nullOutput, options.getOutputFile(options.inputFiles[0]));
    }
    {
        Options options;
        auto args = makeArray("x.zst", "-do", nullOutput);
        EXPECT_SUCCESS(options.parse(args.size(), args.data()));
        EXPECT_EQ(nullOutput, options.getOutputFile(options.inputFiles[0]));
    }
    {
        Options options;
        auto args = makeArray("x.zst", "-d");
        EXPECT_SUCCESS(options.parse(args.size(), args.data()));
        EXPECT_EQ("x", options.getOutputFile(options.inputFiles[0]));
    }
    {
        Options options;
        auto args = makeArray("xzst", "-d");
        EXPECT_SUCCESS(options.parse(args.size(), args.data()));
        EXPECT_EQ("", options.getOutputFile(options.inputFiles[0]));
    }
    {
        Options options;
        auto args = makeArray("xzst", "-doxx");
        EXPECT_SUCCESS(options.parse(args.size(), args.data()));
        EXPECT_EQ("xx", options.getOutputFile(options.inputFiles[0]));
    }
}

TEST(Options, MultipleFiles) {
    {
        Options options;
        auto args = makeArray("x", "y", "z");
        EXPECT_SUCCESS(options.parse(args.size(), args.data()));
        Options expected;
        expected.inputFiles = {"x", "y", "z"};
        expected.verbosity = 1;
        EXPECT_EQ(expected, options);
    }
    {
        Options options;
        auto args = makeArray("x", "y", "z", "-o", nullOutput);
        EXPECT_SUCCESS(options.parse(args.size(), args.data()));
        Options expected;
        expected.inputFiles = {"x", "y", "z"};
        expected.outputFile = nullOutput;
        expected.verbosity = 1;
        EXPECT_EQ(expected, options);
    }
    {
        Options options;
        auto args = makeArray("x", "y", "-o-");
        EXPECT_FAILURE(options.parse(args.size(), args.data()));
    }
    {
        Options options;
        auto args = makeArray("x", "y", "-o", "file");
        EXPECT_FAILURE(options.parse(args.size(), args.data()));
    }
    {
        Options options;
        auto args = makeArray("-qqvd12qp4", "-f", "x", "--", "--rm", "-c");
        EXPECT_SUCCESS(options.parse(args.size(), args.data()));
        Options expected = {4, 23, 12, true, {"x", "--rm", "-c"}, "", true, true, autoMode, true, 0};
        EXPECT_EQ(expected, options);
    }
}

TEST(Options, NumThreads) {
    {
        Options options;
        auto args = makeArray("x", "-dfo", "-");
        EXPECT_SUCCESS(options.parse(args.size(), args.data()));
    }
    {
        Options options;
        auto args = makeArray("x", "-p", "0", "-fo", "-");
        EXPECT_FAILURE(options.parse(args.size(), args.data()));
    }
    {
        Options options;
        auto args = makeArray("-f", "-p", "-o", "-");
        EXPECT_FAILURE(options.parse(args.size(), args.data()));
    }
}

TEST(Options, BadCompressionLevel) {
    {
        Options options;
        auto args = makeArray("x", "-20");
        EXPECT_FAILURE(options.parse(args.size(), args.data()));
    }
    {
        Options options;
        auto args = makeArray("x", "--ultra", "-23");
        EXPECT_FAILURE(options.parse(args.size(), args.data()));
    }
    {
        Options options;
        auto args = makeArray("x", "--1");  // negative 1?
        EXPECT_FAILURE(options.parse(args.size(), args.data()));
    }
}

TEST(Options, InvalidOption) {
    {
        Options options;
        auto args = makeArray("x", "-x");
        EXPECT_FAILURE(options.parse(args.size(), args.data()));
    }
}

TEST(Options, BadOutputFile) {
    {
        Options options;
        auto args = makeArray("notzst", "-d", "-p", "1");
        EXPECT_SUCCESS(options.parse(args.size(), args.data()));
        EXPECT_EQ("", options.getOutputFile(options.inputFiles.front()));
    }
}

TEST(Options, BadOptionsWithArguments) {
    {
        Options options;
        auto args = makeArray("x", "-pf");
        EXPECT_FAILURE(options.parse(args.size(), args.data()));
    }
    {
        Options options;
        auto args = makeArray("x", "-p", "10f");
        EXPECT_FAILURE(options.parse(args.size(), args.data()));
    }
    {
        Options options;
        auto args = makeArray("x", "-p");
        EXPECT_FAILURE(options.parse(args.size(), args.data()));
    }
    {
        Options options;
        auto args = makeArray("x", "-o");
        EXPECT_FAILURE(options.parse(args.size(), args.data()));
    }
    {
        Options options;
        auto args = makeArray("x", "-o");
        EXPECT_FAILURE(options.parse(args.size(), args.data()));
    }
}

TEST(Options, KeepSource) {
    {
        Options options;
        auto args = makeArray("x", "--rm", "-k");
        EXPECT_SUCCESS(options.parse(args.size(), args.data()));
        EXPECT_EQ(true, options.keepSource);
    }
    {
        Options options;
        auto args = makeArray("x", "--rm", "--keep");
        EXPECT_SUCCESS(options.parse(args.size(), args.data()));
        EXPECT_EQ(true, options.keepSource);
    }
    {
        Options options;
        auto args = makeArray("x");
        EXPECT_SUCCESS(options.parse(args.size(), args.data()));
        EXPECT_EQ(true, options.keepSource);
    }
    {
        Options options;
        auto args = makeArray("x", "--rm");
        EXPECT_SUCCESS(options.parse(args.size(), args.data()));
        EXPECT_EQ(false, options.keepSource);
    }
}

TEST(Options, Verbosity) {
    {
        Options options;
        auto args = makeArray("x");
        EXPECT_SUCCESS(options.parse(args.size(), args.data()));
        EXPECT_EQ(2, options.verbosity);
    }
    {
        Options options;
        auto args = makeArray("--quiet", "-qq", "x");
        EXPECT_SUCCESS(options.parse(args.size(), args.data()));
        EXPECT_EQ(-1, options.verbosity);
    }
    {
        Options options;
        auto args = makeArray("x", "y");
        EXPECT_SUCCESS(options.parse(args.size(), args.data()));
        EXPECT_EQ(1, options.verbosity);
    }
    {
        Options options;
        auto args = makeArray("--", "x", "y");
        EXPECT_SUCCESS(options.parse(args.size(), args.data()));
        EXPECT_EQ(1, options.verbosity);
    }
    {
        Options options;
        auto args = makeArray("-qv", "x", "y");
        EXPECT_SUCCESS(options.parse(args.size(), args.data()));
        EXPECT_EQ(1, options.verbosity);
    }
    {
        Options options;
        auto args = makeArray("-v", "x", "y");
        EXPECT_SUCCESS(options.parse(args.size(), args.data()));
        EXPECT_EQ(3, options.verbosity);
    }
    {
        Options options;
        auto args = makeArray("-v", "x");
        EXPECT_SUCCESS(options.parse(args.size(), args.data()));
        EXPECT_EQ(3, options.verbosity);
    }
}

TEST(Options, TestMode) {
    {
        Options options;
        auto args = makeArray("x", "-t");
        EXPECT_SUCCESS(options.parse(args.size(), args.data()));
        EXPECT_EQ(true, options.keepSource);
        EXPECT_EQ(true, options.decompress);
        EXPECT_EQ(nullOutput, options.outputFile);
    }
    {
        Options options;
        auto args = makeArray("x", "--test", "--rm", "-ohello");
        EXPECT_SUCCESS(options.parse(args.size(), args.data()));
        EXPECT_EQ(true, options.keepSource);
        EXPECT_EQ(true, options.decompress);
        EXPECT_EQ(nullOutput, options.outputFile);
    }
}

TEST(Options, Checksum) {
    {
        Options options;
        auto args = makeArray("x.zst", "--no-check", "-Cd");
        EXPECT_SUCCESS(options.parse(args.size(), args.data()));
        EXPECT_EQ(true, options.checksum);
    }
    {
        Options options;
        auto args = makeArray("x");
        EXPECT_SUCCESS(options.parse(args.size(), args.data()));
        EXPECT_EQ(true, options.checksum);
    }
    {
        Options options;
        auto args = makeArray("x", "--no-check", "--check");
        EXPECT_SUCCESS(options.parse(args.size(), args.data()));
        EXPECT_EQ(true, options.checksum);
    }
    {
        Options options;
        auto args = makeArray("x", "--no-check");
        EXPECT_SUCCESS(options.parse(args.size(), args.data()));
        EXPECT_EQ(false, options.checksum);
    }
}

TEST(Options, InputFiles) {
    {
        Options options;
        auto args = makeArray("-cd");
        options.parse(args.size(), args.data());
        EXPECT_EQ(1, options.inputFiles.size());
        EXPECT_EQ("-", options.inputFiles[0]);
        EXPECT_EQ("-", options.outputFile);
    }
    {
        Options options;
        auto args = makeArray();
        options.parse(args.size(), args.data());
        EXPECT_EQ(1, options.inputFiles.size());
        EXPECT_EQ("-", options.inputFiles[0]);
        EXPECT_EQ("-", options.outputFile);
    }
    {
        Options options;
        auto args = makeArray("-d");
        options.parse(args.size(), args.data());
        EXPECT_EQ(1, options.inputFiles.size());
        EXPECT_EQ("-", options.inputFiles[0]);
        EXPECT_EQ("-", options.outputFile);
    }
    {
        Options options;
        auto args = makeArray("x", "-");
        EXPECT_FAILURE(options.parse(args.size(), args.data()));
    }
}

TEST(Options, InvalidOptions) {
    {
        Options options;
        auto args = makeArray("-ibasdf");
        EXPECT_FAILURE(options.parse(args.size(), args.data()));
    }
    {
        Options options;
        auto args = makeArray("- ");
        EXPECT_FAILURE(options.parse(args.size(), args.data()));
    }
    {
        Options options;
        auto args = makeArray("-n15");
        EXPECT_FAILURE(options.parse(args.size(), args.data()));
    }
    {
        Options options;
        auto args = makeArray("-0", "x");
        EXPECT_FAILURE(options.parse(args.size(), args.data()));
    }
}

TEST(Options, Extras) {
    {
        Options options;
        auto args = makeArray("-h");
        EXPECT_MESSAGE(options.parse(args.size(), args.data()));
    }
    {
        Options options;
        auto args = makeArray("-H");
        EXPECT_MESSAGE(options.parse(args.size(), args.data()));
    }
    {
        Options options;
        auto args = makeArray("-V");
        EXPECT_MESSAGE(options.parse(args.size(), args.data()));
    }
    {
        Options options;
        auto args = makeArray("--help");
        EXPECT_MESSAGE(options.parse(args.size(), args.data()));
    }
    {
        Options options;
        auto args = makeArray("--version");
        EXPECT_MESSAGE(options.parse(args.size(), args.data()));
    }
}
